Improvement in drill-sharpeners



3 UNITED STATES ATENT OFFICE.

THOMAS, J.;W'1LLI MsoN, OF- CARSON CITY, NEVADA.

IMPROVEMENT IN DRILL-SHARPENERS? Specification forming part of Letters Patent No. 219,133, dated September 2,1879; application filed December 31, 1878.

To all whom it may concern: I

Be'it known that I, THOMAS J. WILLIAM- SON, of Carson City, in the county of Orinsby and State of Nevada, have invented a new and useful Improvement in Drill-Sharpeners, of

which the following is a specification.

The object of my invention is to furnish a simple and efficient illSbl'llIllGllbfi)? sharpening well-drills and cold-chisels.

1 will first describe the invention in connection with. the drawings.

Figure 1 is a plan view of my improved sharpening-instrument. Fig. 2 is a sectional elevation on line 00 w. Fig.3 is a side view of one die.

Similar letters of reference indicate corresponding parts. i V g 1- The blocks a, that carry the dies b b, are made of iron, and hingedtogether by a pin, .0, so as to divide transversely on the line betweendies b, to permit insertion or removal of the drill.

The steel dies 1) are held ina dovetail mortise in the upper side of blocks a, so that each is held securely. The adjacent faces of the dies are formed with recesses of a shape corre' sponding to the drill-points, as at c. There are three of the recesses in the dies b, adapted for drills ofdiffering sizes, so that either one of the recesses or openings maybe used, according to the size of drill that'is to be sharpened. Y

The instrument is to be used in the following-described manner: The drill to be sharpened is first heated, and then the end or point placed between the dies 12 in the recess 0, that corresponds to the diameter of the drill, and th eblocks and dies closed upon the drill-point; then, by striking a few blows with a hammer on the drill-head, the point is spread and caused to take the shape of the recess and the edge sharpened. The drill is thereby brought to the uniform size, and the angles that may be broken filled out. The drill is then removed by opening the block and dies, and hardened by plunging it in water.

This device is simple, and requires no special skill for its use. It is adapted for use at the place where a well is being drilled. or holes drilled for blasting, and bythe men using the tools. the drilled hole, can be kept of uniform size. Miners generally use three sizes of drills, and I therefore construct the instrument so that it is adapted for the three sizes used.

Having thus described myinvention, I claim as new and desire to secure by Letters Patentw The dies 1) b, formed with recesses c, in combination with the blocks a, hinged together on the line between the dies, substantially as described and shown, the Whole forming an instrument adapted for use in sharpening drilling-tools, as specified.

THOMAS JAMES VVILL IAMSON Witnesses:

JAMES E. DEALY, R. B. MGMAHON.

By its use the drills, and consequently 

